NetworkSafeConnection

This is the new class for Safe network interaction I mentioned before in issues. It provides non-interruptable workflow for clients (retrying after socket errors, hiding this info from client, but can dump warning in the log stream, if one is provided)

I have implemented the class and test-doc for it.

Also I have used this new class on our production to replaces nasty binding of internal queues and omniORBpy to simplify things.